Stool design



FIG. 1 is a front view of the stool of a new design, according to the preferred embodiment;

FIG. 2 is a front perspective view of the stool design of FIG. 1; and,

FIG. 3 is an enlarged partial perspective view of the chair design of FIG. 1; 

We claim the ornamental design for a stool, as shown and described. 